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CIRCULATION, BLOOD AND GLANDS :*o3
In the Gorilla, according to Eisler ;442^ the thoracic duct is single, but the glands are fewer than in Man. He describes several glands in the neck, pulmonary roots. anterior mediastinum, axilla and posterior part of the pelvis. In the Orang I observed a single duct and many glands lie at the root of the neck,
Section D. — THE DUCTLESS GLANDS.
The thyroid gland varies in each Ape. In the Chimpanzee there may be two disconnected lobe,?, two lateral lobes united by an isthmus, or a long, narrow. XT-shaped body (fig. 4:2). There is no strong capsule, and no pyramidal lobe. In the Gorilla the lateral lobes may be separate, or connected by an isthmus, and Deniker (44) observed it contained in a common sheath with the thymus in the foetus. In all specimens of Hijlolntes the isthmus is small and the lateral lobes are massive.
The thymus atrophies as age advances, but a trace is sometimes found even in old animals. In the Chimpanzee it consists of two parts reaching over the pericardium from the thoracic inlet to the third or fifth costal cartilage. It is coarsely lobulated, but is not hollowed out at any part. In the Gorilla it is divided into right, middle and left lobes in the foetus (Deniker), and it appears that it atrophies quicker than in Man. It is large in the Gibbons, and Kohlbriigge observed it covering the heart in an adult Siamang.
The spleen varies considerably in size and shape, not only in different examples of each Ape, but at different periods in digestion in each. Accessory spleens may be present (399).
The suprarenal capsules are very similar in all the